/* $Header: /roq/tiff/tif_dumpmode.c 1     11/02/99 4:39p Zaphod $ */



/*

 * Copyright (c) 1988-1996 Sam Leffler

 * Copyright (c) 1991-1996 Silicon Graphics, Inc.

 *

 * Permission to use, copy, modify, distribute, and sell this software and 

 * its documentation for any purpose is hereby granted without fee, provided

 * that (i) the above copyright notices and this permission notice appear in

 * all copies of the software and related documentation, and (ii) the names of

 * Sam Leffler and Silicon Graphics may not be used in any advertising or

 * publicity relating to the software without the specific, prior written

 * permission of Sam Leffler and Silicon Graphics.

 * 

 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 

 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY 

 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  

 * 

 * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR

 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,

 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,

 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF 

 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 

 * OF THIS SOFTWARE.

 */



/*

 * TIFF Library.

 *

 * "Null" Compression Algorithm Support.

 */

#include "tiffiop.h"



/*

 * Encode a hunk of pixels.

 */

static int

DumpModeEncode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s)

{

	(void) s;

	while (cc > 0) {

		tsize_t n;



		n = cc;

		if (tif->tif_rawcc + n > tif->tif_rawdatasize)

			n = tif->tif_rawdatasize - tif->tif_rawcc;

		/*

		 * Avoid copy if client has setup raw

		 * data buffer to avoid extra copy.

		 */

		if (tif->tif_rawcp != pp)

			_TIFFmemcpy(tif->tif_rawcp, pp, n);

		tif->tif_rawcp += n;

		tif->tif_rawcc += n;

		pp += n;

		cc -= n;

		if (tif->tif_rawcc >= tif->tif_rawdatasize &&

		    !TIFFFlushData1(tif))

			return (-1);

	}

	return (1);

}



/*

 * Decode a hunk of pixels.

 */

static int

DumpModeDecode(TIFF* tif, tidata_t buf, tsize_t cc, tsample_t s)

{

	(void) s;

	if (tif->tif_rawcc < cc) {

		TIFFError(tif->tif_name,

		    "DumpModeDecode: Not enough data for scanline %d",

		    tif->tif_row);

		return (0);

	}

	/*

	 * Avoid copy if client has setup raw

	 * data buffer to avoid extra copy.

	 */

	if (tif->tif_rawcp != buf)

		_TIFFmemcpy(buf, tif->tif_rawcp, cc);

	tif->tif_rawcp += cc;

	tif->tif_rawcc -= cc;

	return (1);

}



/*

 * Seek forwards nrows in the current strip.

 */

static int

DumpModeSeek(TIFF* tif, uint32 nrows)

{

	tif->tif_rawcp += nrows * tif->tif_scanlinesize;

	tif->tif_rawcc -= nrows * tif->tif_scanlinesize;

	return (1);

}



/*

 * Initialize dump mode.

 */

int

TIFFInitDumpMode(TIFF* tif, int scheme)

{

	(void) scheme;

	tif->tif_decoderow = DumpModeDecode;

	tif->tif_decodestrip = DumpModeDecode;

	tif->tif_decodetile = DumpModeDecode;

	tif->tif_encoderow = DumpModeEncode;

	tif->tif_encodestrip = DumpModeEncode;

	tif->tif_encodetile = DumpModeEncode;

	tif->tif_seek = DumpModeSeek;

	return (1);

}

